论文标题
Anharmonic声子阻尼增强了BCS型超导体的$ T_C $
Anharmonic phonon damping enhances the $T_c$ of BCS-type superconductors
论文作者
论文摘要
在配对机制中明确考虑了在声学或光学的声音阻尼中所需的非谐度的效果的超导性理论。解决了差距方程，包括用于纵向声音子的扩散akhiezer抑制作用，或用于光子声子的klemens抑制作用，带有阻尼系数，在任何一种情况下，它都可以直接与Gruneisen参数直接相关，并且在原子质电位中的肛门系数都可以直接相关。结果表明，非谐度的增加对临界温度$ t_ {c} $具有显着的非单调效应。最佳阻尼系数产生的最大$ T_C $是由骨介体的速度设置的。该理论可能会为材料设计打开前所未有的机会，在这些理论中，$ t_ {c} $可以通过原子间潜力的非谐调来调整，并在最近发现的Hylyides中对超导性产生了影响，在最近发现的Hymarmonicity中，非胸度非常强大，对于Anharmonic Damping尤其相关。
A theory of superconductivity is presented where the effect of anharmonicity, as entailed in the acoustic, or optical, phonon damping, is explicitly considered in the pairing mechanism. The gap equation is solved including diffusive Akhiezer damping for longitudinal acoustic phonons or Klemens damping for optical phonons, with a damping coefficient which, in either case, can be directly related to the Gruneisen parameter and hence to the anharmonic coefficients in the interatomic potential. The results show that the increase of anharmonicity has a strikingly non-monotonic effect on the critical temperature $T_{c}$. The optimal damping coefficient yielding maximum $T_c$ is set by the velocity of the bosonic mediator. This theory may open up unprecedented opportunities for material design where $T_{c}$ may be tuned via the anharmonicity of the interatomic potential, and presents implications for the superconductivity in the recently discovered hydrides, where anharmonicity is very strong and for which the anharmonic damping is especially relevant.
